Processing, Microstructure and Mechanical Property Correlation in Al-B_4C Surface Composite Produced via Friction Stir Processing

摘要

Friction stir processing (FSP) was employed to prepare surface composite (SC) composed of B_4C particles in 5024 Al matrix. The processing parameters, such as hole pattern and geometry, and the number of FSP passes, were optimized to obtain uniform powder distribution. The micrographs revealed a homogeneous distribution of the particles with good interfacial bonding. The hardness of the composite was uniform across the processed region which again indicates the uniformity of powder distribution. The modulus of the surface composite was measured using strain gage and showed a significant improvement.